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Coupled quantum dots: manifestation of an artificial molecule

✍ Scribed by D. Pfannkuche; R.H. Blick; R.J. Haug; K. von Klitzing; K. Eberl

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
276 KB
Volume
23
Category
Article
ISSN
0749-6036

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✦ Synopsis

Transport spectroscopy reveals the microscopic features of few-electron quantum dots which justify the name artificial atoms. New physics evolve when two quantum dots are coupled by a tunneling barrier. We study, both theoretically and experimentally, the tunneling spectroscopy on a double quantum dot. A detailed lineshape analysis of the conductance resonances proves that off-resonant coherent interdot tunneling governs transport through this system, while tunneling into the double quantum dot occurs resonantly. This coherent interdot tunneling witnesses the evolution of a delocalized electronic state which can be compared to a valence electron of this artificial molecule.

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